Hubert c



H. C. HART.

MATHEMATICAL INSTRUMENT. VAPPLICATION man MAY13.1919.

Patented Nov, 4, 1919.

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MATHEMATIGAL INSTRUMENT. Q

Specification of Letterslatent.

PatentedNov. 4, 1919.

Application le. May` 13, 1919. Serial No. 296,906.

To all whom t may concern.'

Be it known that I, HUBERT C. HART, a citizen of the United States, residing at Unionville, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inlJIathematical Instruments, of which the -following is a specification. Q

This invention relates to what I shall consider as a mathematical instrument. I use this term, as will be inferred, more or less as 'a matter of convenience. The implement can obviously be employed with facility in several dilierent arts. purposes of the invention is the provision of an article of the kind set forth which can be inexpensively, easily and readily made, and which is capable of exercising several For instance, on the one hand it might Vbe used as a square, while on the other it may be utilized, after proper inanipulation, as a rule. f

In the drawings accompanying and' forming part of the present specification, I have shown in detail one of the several forms Aof embodimentof theinvention, which to enable those skilledin the. art to :practice the same will be set forthfully in the following description. I am not limited Ato this particular showing. I may depart therefrom in several respects within the scope of the invention defined by the claims following the said description.

Referring to the drawings:

Figure 1 is an elevation of an instrument involving the invention, in folded or collapsed condition.l

Fig. 2 is an edge view of the same,'as seen for instance from the right inFig. 1.

Fig. 3 is a face view of the same, partially opened out.

Fig. 4 is a view of the instrument with the parts adjusted to produce a square.

Fig. 5 is a view of two of the sections in longitudinal alinement and with the third folded within one of the other sections.

Fig. 6 is a transverse section on the line 6-6 of Fig. 2, looking in the direction of the arrows.

Like characters refer to like parts throughout the several views which are on different scales. i

As will be understood, the subject mattei' of the present case is really in the nature o f a combination implement, although it should be stated at this point that this con# @ne of the primaryl dition may not always be present, because i by virtue of one of the points of the invention, I may fold the article into a small compass, which is a consideration of some importance. TWhen folded or knocked down, it can be easily carried in the pocket or ina tool boX. j y l The device comprises as shown three sections as 2, 3 and 4, the sections 2 and 3 constituting in effect the body or lmain partV of the implement, the section 4 presenting an auxiliary member. rIhese sections 2, 3. and 4 may be made fromY any one of several different kinds of materials or of a composition of substances. They might be of metal or they might be of wood or of Celluloid or anything else for that matter suitable for the purpose. lhe sections 2 and 3 are as shown flexibly united as by a, knuckle-joint 5, at their inner ends. These sections 2 and 3 can be folded in superimposed or abutting relation as shown in Fig. 1 for example, or can beVV opened out into'longitudinal alinement Aas shown by Fig.kk 5 or can occupyany one of'a large number of intermediate positions, one of which is shown in Fig. 3., Each of them is channeled throughout its complete length, the ends of the respective channelsV being open-except forA the obstruction oered by A purpose, between the side cheeks or flanges of the section 3, near the outer end thereof. This section 4 consists as shown of a somewhat elongated flat strip of rectangular form, its width being a littlepless than the combined width of the sections 2 and 3. The body sectionv 2 is shown as having near its free end, the notch or slot 7 which can be easily produced by cutting away lthe bottom or outer wall of said section, a proper distance back from the front or free end thereof.V The length of the slot 7 in fact is a trifle more than one-half the width of the section 4 for a reason that will hereinafter appear.

In Figs. l and 2 the instrument is shown as folded, the inner edge or edges ofthe sections 52 and 3 being in abutment throughout their complete length and ointly inclosing the section 4, which it ywill be remembered is jointed to the section 3. To open out the instrument, it is simplyn'ecessary to spread the sections 2 and 3 a distance sufficient to permit the section4 to be swung to Yright angles to the section 3, the relation it is shown as occupying in Fig. 4, at which time the inner squared end of said section 4 will strike substantially against the bottom of f the section 3. When this is done, thesectioii 2`is swung-down*` upon the section `3 `and as it approaches such relation the section 4 is received vwithin the notch or slot 7, thus firmly holding the section 4 in a position at rightA angles to thejsupeiimposed or abutting sections 2 and 3 as illustrated'by Fig. 4. This obviously produces a square. The sections 2 and 3, if desired, may be brought into longitudinal coincidence as shown in Fig. Y5, thus enabling them to jointly serve as a rule, this whether the section4 be between thev side `flanges of the section 3 or not.

auxiliary section jointed to` one ofthe main sections, the Vmain sections. being adapted' to inclose the auxiliary AsectionV and one ofthey main sections having means to hold the auxiliary section at a predetermined angleto the mainV sectionfwhichcarries it. fl

2." An 'nstru-ment of the Vclass described comprising two channeled `main sections jointed tofeach other and anauxiliary section jointed to one of the main sections, the

Copies ofithis patent may be cbtained'forrve cents each, by addressng'the icommisslionlrvot llatntis,

Washinton, D. v-

main sections being adapted to 'receive and 'jointly inclose the auxiliary section and one of the mainsections-liavingmeans to hold the axuiliar section at an angle to the mail section to w ich it isconnected.

3.*An instrument of the class described comprising two main sections jointed toeach other, an auxiliary section jointed to one of the main sections, the main Vsections being adapted together to inclose the auxiliary section, the auxiliarysection-being movable to an angle to thesection which carries it, the other main section having a notch to receive the auxiliary section and the end of the notch being adapted to hold the auxiliary section in'its adjusted position.y -1 v 4. An :instrument of the class described comprising two main channeled. sections jointed Yat their ends to each other, and an auxiliary section jointed to` one of the main :i

main section Vwhen the auxiliary section is thus' folded being adapted withk said'main section to inclose ,the auxiliary section, the auxiliary section, when the main sectionsare.

opened, bein movable toroccupya position at right ang es to the section which carries it, the other main sectio'nhaving ajslrot at its,

Yfree end which receives the auxiliary section when at right angles to themain section carrying it,- theY auxiliary section wheninsaid right angular `position being adapted to abuty against the back wall of saidslot; r y

In testimonywhereof I aflix my signature inthe presence of two witnesses'. f HUBERTV C.-HART. VWitnesses: Y y' f v .-7

` MARGARETT. DENNIs,y

HEATH SUTHERLAND. A; 

